Drilling machine



Oct. 23, 1934. N. D. I EvlN DRILLING MACHINE Original Filed Nov. 18,1927 3 Sheets-Sheet l Oct. 23, 1934. N, D. `I EVIN 1,978,368

DRILLING MACHINE Original Filed Nov. 18, 1927 3 Sheets-Sheet 2 Oct; 23,1934. N. D. l-:vlN

DRILLING MACHINE Original Filed Nov. 18, 1927 3 Sheets-Sheet 5 l mil/lllPatented Oct. 23, 1934 PATENT orties DRILLING RIACHINE Nils D. Levin,Columbus, Ohio, assigner to The .Icirey Manufacturing Company, Columbus,Ohio, a corporation of Ohio Application November 18, 1927, Serial No.234,184 Renewed March 16, 1932 34 Claims.

The present invention relates to certain new and useful improvements indrilling machines, and particularly to drilling machines adapted toboreholes in the coal body to receive the blasting chargesby which the coalis broken and disto another andl to rest upon and be braced byy saidrails during the drilling operation.

A furtherobject is to provide, in a machine such as above described,improved drill supporting devices associated with power actuatedmechanism, whereby the drilling devices may be expeditiously,conveniently and accurately adjusted to suitably position the blastingholes in relation to the material which is to be dislodged.

i The means whereby I attain these objects are fully set forth in thefollowing specication and illustrated in the accompanying` drawings ofwhich Fig. 1 is a side elevation of what is now thought 254 to be thepreferred embodiment of my invention.

Fig. 2 is a plan View of the mechanism disclosed in Fig. 1.

Fig. 3 is a plan view of the supporting'truck Y element of the machineillustrated in Figs. 1 and 2, the upper parts being broken away toreveal the truck driving mechanism.

Fig. 4 is a side elevation of the drill supporting and actuatingmechanism.

Fig. 5 is a sectional view taken along the central longitudinal verticalplane of the devices shown in Fig. 4.

Fig. 6 is a fragmentary view, partly in sec` ing mechanism.

Fig. 7 is a detail of the drill actuating mech` anism. l i

Fig. 8 is a plan view of a portion of a mine room with the machineaccording to the present invention in Working position.

Like numerals refer to similar parts in the several figures.

The embodiment of my invention illustrated in the drawings comprises atruckhaving a main supporting frame 1 to which are attached the journalboxes `2. In the journal boxes 2 are journaled the axles 3 havingllanged track wheels 4 adapted to rest upon and travel along the rails 5of the mine track. Mounted upon the .55 truck frame l is a motor 6 whichmay be:` of any the same horizontal planes as the arm 23.

preferred type suitable to the conditions under which the machineoperates. For purposes of illustration I have here shown an electricmotor connected and arranged to receive its actuating current throughthe iiexible conductor cable 7 from any suitable and convenient sourceof current supply. The conductorcable 7 is adapted to be wound upon theautomatic cable reel 8 in the manner which is Well understood in thecoal mining art. Suitable means is provided for the control of the motor6 inthe controlling mechanism 9 which may be of the common and wellknown type. The motor isprovided with an armature pinion 10 whichengages a spur gear `11 xed to the countershaft 12. A sprocket wheel 13fixed tothe countershaft 12 is connected by an endless chain 14'With thesprocket wheel 15 mounted upon the axle 3 toithereby cause the actuationof the traction wheels 4 from the motor 6 to propel the truck along therails 5 of the mine track from oneworking place to another. Fixed totheaxle 3 is a brake drum 16 having a suitable brake band adapted to becontrolled by the brake lever 17 to lock the traction wheels 4 againstrotation and thereby anchor the truck in the preferred position relativeto the coal face.

Rigidly attached to the truck frame 1 is a supporting frame 18` having atop plate 19 the forward part of which is of circular outline concentricwith the pivot members to be hereinafter described. The pivot memberscomprise the vertically disposed bearings 20 and 21 which are formed inthe supporting frame work 18, and in these bearings is journaled asleeve 22 which is rigidly attached to the horizontally extending arm 23and constitutes the pivotal support about which said arm swings in ahorizontal plane. Within the sleeve 22 is journaled a second sleeve 24which is rigidly attached to a second horizontally extending arm 25 andconstitutes the pivot about which said second arm swings in The arms 23and 25 are each provided with laterally projecting brackets 26 wherein.are vmounted the rollers 27 which bear upon the arcuate rail 28attached to the top plate 19 concentric with the pivot bearings 20 and21. The rollers 27 constitute fulcrum supports for the loads upon theoverhanging ends of the arms 23 and 25. The upward thrust of the innerends of the arms 23 and 25 is taken by the pivot bolt 29 which isattached to the inner sleeve 24 by a suitable rivet and which projectsthrough the outer sleeve 22 and through the bottom of the lower bearing20 against` which the nut 30 abuts.

The arms 23 and 25 are substantially alike and a description of oneapplies to both. Formed in the periphery of the plate 19 are notches 3ladapted to be engaged by the corresponding teeth of the latch member 32to lock the arm 23 in the preferred position of angular adjustment aboutits pivotal support. The latch 32 is slidable in guideways 33 of the arm23 and is engaged by a compression spring 34 whereby it is moved intoand retained in locking position. The latch 32 is also connected with anoperating lever 35 positioned convenient to the hand of the operator, bythe manipulation of which the latch 32 may be released to permitadjustment of the arm 23.

Fixed to the outer end of the arm 23 is a casting 36 which constitutesthe supporting base upon which the turntable 37 is pivotally mounted.Formed in the periphery of the turntable 37 are notches 38 adapted toengage the corresponding teeth of the latch member 39 to lock theturntable 97 in the preferred position of angular adjustment about itsaxis. The latch 39 is slidable in guideways 40 of the arm 23 and isengaged by a compression spring 41 whereby it is moved into and retainedin locking position. The latch 39 is also connected with an operatinglever 42 positioned convenient to the hand of the operator by themanipulation of which the latch may be released to permit rotation ofthe turntable about itsk axis.

Formed on the turntable 37 are two parallel transversely extending ribs43 upon which are formed journal bearings 44, and in these bearings isrotatably'mounted the pivot pin 45. Supported upon the pivot pin 45 is amotor 46 which may be of any preferred type suitable to the conditionsunder which the machine operates. For purposes of illustration l havehere shown an electric motor adapted to receive its actuating currentthrough suitable flexible conductors not shown in the drawings but whichare connected with the automatic cable reel 8 and the flexible conductorcable wound thereon. The motor 46 is adapted to be controlled by asuitable controller switch 47 which is preferably of a type well knownin the mining art, and which it is not thought necessary to furtherdescribe at this time.

Projecting from the outer end of the frame of the motor 46 is a gearcasing 43 to which is attached a steel tube 49. The outer end of thetube 49 extends into a socket 50, formed integral with the casting 50awhich constitutes the main frame of the drilling mechanism. A clampingscrew 59D affords means to vary the frictional engagement of thesurfaces of the socket 50 and the tube 49 to permit rotary adjustment ofthe drilling mechanism about the longitudinal axis of the tube 49, or toclamp said drilling mechanism in the preferred position of angularadjustment relative to said axis. Mounted in journal bearings 51 and 52concentric with the tube 49 is a shaft 53 to the inner end of which isfixed a spur gear 54. The spur gear 54 is connected through a pinion 55and spur gear 56 with the armature pinion 57 of the motor 46 to rotatethe shaft 53. At the outer end of the shaft 53 is fixed a mitre gear 58which is engaged by a similar mitre gear 59 formed integral with thesleeve 69 journaled in a bearing 6l of the casting 56. Extending throughthe sleeve 60 concentric therewith is a feed shaft 62 having at itsforward end a socket 63 adapted to receive the drilling tool 64. Theshaft 62 is provided with a longitudinally extending keyway 65 whichengages a suitable key of the sleeve 60 to rotatively connect the shaft62 with the sleeve 60 while permitting its longitudinal movementrelative thereto. Extending from end to end of the shaft 62 is a screwthread adapted to be engaged by a feed nut 66 which is of the typecommonly used with drilling mechanism, and which is adapted to beoptionally adjusted to engage the screw thread of the feed shaft 62. Thefeed nut 66 is attached to the casting 50 in a manner which is wellunderstood in the mining art, and serves, when in engagement with thescrew thread to force the shaft 62 longitudinally forward to feed thedrill tool to its work. When the feed nut is so adjusted as to be out ofengagement with the screw thread, the shaft 62 will be free to slidelongitudinally of the sleeve to position the drill tool 64 relative tothe material which is to be operated upon.

Journaled in suitable bearings 67 and 68 is a screw shaft 69 extendingparallel with vthe shaft 53, and engaged by a crosshead 70 in suchmanner that rotation of the shaft 69 in one direction will causemovement of the crosshead 70 toward the motor 46, while rotation of theshaft 69 in the opposite direction will cause said crosshead to moveaway from said motor. Fixed to the screw shaft 69 is a spur gear 7lwhichextends through an aperture in the steel tube 49 and engages a spurpinion 72 mounted upon the shaft 53 for free rotation relative thereto.Fixed to the screw shaft 69 remote from the spur gear 71 is a sprocketwheel 73 engaged by an endless chain 74 which extends through anaperture in the tube 49 and engages a sprocket wheel 75 mounted upon theshaft 53 for free rotation relative thereto. Formed integral with thepinion 72 and the sprocket wheel 75 are the sockets '76 and 77respectively, which are adapted to be engaged by the cones 78 and 79formed upon the sliding member 80 which is slidable upon the shaft 53and rotatably connected thereto by a suitable key 81. Formed in thesliding member 80 is a circumferential groove 82 which is engaged by alug 63 attached to the ends of the cylindrical hub 84 of the handwheel85 and eccentric thereto. The hub 84 is rotatably mounted in a journalbearing 86 attached to the tube 49 in such manner that rotation of thehandwheel will cause longitudinal movement of the sliding member 80relative to the shaft 53. By the manipulation of the handwheel 85 thecone 78 may be forced into engagement with the socket 76 to drive thespur pinion 72 and through it to cause rotation of the screw shaft 69 ina direction to propel the crosshead 70 in one direction, or to force thecone 79 into engagement with the socket 77 to drive the sprocket wheel75 and through it to rotate the screw shaft 69 in the opposite directionto thereby propel the crosshead 70 in the opposite direction. Pivotallyconnected to the crosshead 70 are connecting rods 87 which are anchoredto upstanding projections 88 of the ribs 43 of the turntable 37. Whenthe crosshead 70 is moved outwardly along the screw shaft 69 the pullupon the connecting rods 87 produces upward rotation of the drillingmechanism about the pivot pin 45 to elevate the drilling mechanism, andwhen said crosshead 70 is moved inwardly along the screw shaft 69 thedrilling mechanism will be rotated downwardly about the pivot pin 45.

When the handwheel 85 is so manipulated that l the slide .member 80 isheld in its central position, engaging neither of the sockets 76 nor 77the screw shaft 69 will remain stationary, locking the crosshead 70against longitudinal movement, and sej curely holding the drillingmechanism in the preferred position of vertical adjustment.

In the operation of my improved'drilling mechanism actuation of themotor 6 will cause rotation of the track wheels 4 to propel the machinefrom one working place to another, the direction of travel beingcontrolled by manipulation of the controller 9. Current for theactuation of the motor 6 will be secured through the conductor cable '7the free end of which is adapted to `be `connected to the convenientsource of electric supply, such as the trolley Wire arranged in the mineentries.. When the machine has entered the mine room, or other workingplace, and has advanced to the desired position upon the vmine trackadjacent the working face, manipulation of the brake lever 17 will causethe brake mechanism 16 to anchor the truck to the mine track and preventits movement relative to the working face. The hand lever on each of thearms 23 and 25 may then be manipulated to permit rotation of the arms 23and 25 about their pivotal support to the desired positions of angularadjustment, after which the latch members 32 may be allowed to engagethe notches 31 upon the plate 18 to automatically secure said arms inplace. The levers 42 may then be manipulated to unlock the turntables 37and permit their rotation to the desired position of angular adjustmentbringing the drilling mechanism into the desired relation with thematerial which is to be operated upon. After the motor 46'has beenpletion of the hole, or holes, reversal of the operations abovedescribed will again place the apparatus in convenient condition fortransportation to the next working place.

It should be particularly noted that each drill is adjustable andoperable individually and independently of the other and either drillmay be operated from either side of the portable base 1. For instance,the horizontal boom 23 may be moved rearwardly as viewed in Fig. 8entirely oi the arcuate rail 28 thereby allowing free play for the otherhorizontal boom 25 to be swung horizontally on the vertical axis 24relatively to the portable base 1 through a range of approximately 180degrees so as to occupy positions wherein the outer extremity of theboom overhangs either side of the base.

As shown in Figs. 2 and 4 the arm 46, 49 is pivotally connected at tothe outer end of the boom 25 to swing in a vertical plane relatively tothe boom into relatively inclined positions. Fig. 4 shows means betweenthe boom and the arm for swinging the latter up and down on the pivot 45relatively to the boom and for holding the arm in its different adjustedpositions.

The drilling implement is swivelly mounted on the tube 49 and on theaxis of the shaft 53 as shown at 50 in Fig. 5, for rotation through acornplete circle, and may be held in adjusted position by means of theclamp 50h shown in Figs. 2 and 4. The swiveling axis of the drillingirnplenient is at right angles to the vertical axis of the turntable 37.By means of the adjustments on these angularly related axes the drillingtool may, irrespective of the angular position of the horizontal boom25, be adjusted to positions to drill holes at various ,elevations inthe upright coal face in advance of the mine track at right 'angles tosuch face and parallel to the ribs of f the mine entry and parallel tothe mine track and at various distances from the latter. Eithersupporting structure comprising the boom and the arm may be used tolocate the drill for the drilling of holes in parallel relation to eachother over a wide area of the coal face extending between the iloor andthe roof and between the ribs of the mine entry.

When only one supporting structure comprising a boom and an arm is to beemployed the arm 46, 49 may be adjusted into parallelism with the coalface to extend toward one rib or the other from the turntable 37 and thedrill operated at right angles to the coal face in advance or" the minetrack.. For instance; if the supporting structure 23, 46 is swungrearwardly to an inoperative position, the arm 46, 49 at the outer endof the boom 25 may beswung 180 degrees from its position shown in Fig. 8after removing the drill 64 from its holder, and then after swivelingthe tool support 50 180 degrees on its axis the drill may be reinsertedinto its holder. It will thus be seenthat the arm 46, 49 on the boom 25may be swung upwardly `or downwardly above a horizontal plane throughthe boom 25 or below such horizontal plane and along either side of thebase at the rear of the forward end of the latter. Consequently, thesupporting structure comprising thefboom 25 and the arm 46, 49 isadjustable to position the drilling implement in relatively low planesalong either side of the base and below" the top of the base and inrelatively high planes above the top of the base to drill parallel holesat right angles to the coal face and parallel to the ribs and inrelatively low planes and in relatively high planes over a wide area ofthe coal face extending transversely of the forwardend of the minetrack.

"I'he adjustments are made on the vertical pivotal axis 24 of the boom,on the horizontal pivotal axis 45 of the arm and on the angularlyrelated axes including the vertical axis of the turntable 37 and theswivel axis of the tool support 50. The angular position of the boom 25determines the distance of the drilling implement `from the mine track;the angular position of the arm determines the elevation of the drillingimplement; and the adjustments on the rectangularly related axes enablesthe "positioning of the drilling tool parallel to the mine track andparallel to the ribs irrespective of the elevation of the drilling toolor its distance from the mine track.

It should also be observed that the overall height of the track-mounteddrilling machine shown in Fig. 1 is relatively low to adapt the machinefor operation in a low roof mine chamber. As shown in Figs. 2 and 8 thehorizontal booms 23 and 25 are pivoted on a vertical axis 24approximately midway between the ends of the drilling machine. The booms23 and 25 are confined to move in a horizontal plane fixed in elevationand located adjacent to the top of the supporting framework. When theboom 23 is in the position shown in Fig. 8 and the boom 25 is similarlylocated on the opposite side of the machine the front end of the lattermay be stationed near the working face which extends across the space:in advance of the mine track.

It is desirable to drill holes at right angles to the working face andparallel to the ribs and closely adjacent thereto, and also closelyadjacent to the mine bottom and closely adjacent to ie mine roof.Notwithstanding the fact that the roofs may be of various heights andthe ribs may l be at various distances from the mine track, such drillholes may be made by swinging the booms in the horizontal plane andlocking the same in adjusted positions and swinging the arms 46 up ordown on the horizontal axes and holding the same at adjustedinclinations. To position the drill at right angles to the working faceand parallel to the ribs mechanism is provided to afford adjustments ofthe drill on angularly related axes one of which is vertical at thecenter of the turntable 37 and the other of which is permanently atright angles to the axis of the drill, being 1ocated at 53 as shown inFig. 4. It will thus be seen that by swinging the boom 23 in ahorizontal plane at fixed elevation, by swinging the arm 46 in avertical plane, and by adjusting the drill on the angularly related axes23, 53, the drill may be located closely adjacent to the rib at variouselevations including one position closely adjacent to the mine bottomand another position closely adjacent to the mine roof, for the drillingof holes at right angles to the working face and parallel to the rib.I-Ioles may be drilled in any direction either in the ribs or in theworking face in any horizontal plane between the i'ioo-r and the roofand likewise holes may be drilled in any direction in any vertical planebetween the ribs but it should be particularly noted that the drillingof holes in horizontal planes closely adjacent to the mine bottom andclosely adjacent to the mine roof and in vertical planes closelyadjacent to the ribs, and the drilling of holes in the corners of theworking face at right angles thereto, greatly reduces the manual labornecessary after blasting in trimming the floor, roof and ribs to securethe desired continuations thereof.

What I claim is:

l. In a coal drilling machine, the combination with a wheel supportedcarriage adapted` to rest upon and be braced by the rails of a minetrack during the drilling operation, of power devices upon the carriageadapted to propel it along said rails, means to prevent movement of saidcarriage relative to said rails, an arm pivotally attached to saidcarriage for movement in horizontal planes, means to lock said armagainst said pivotal movement, a drill supporting varm pivotallyattached to said iirst mentioned arm and adapted to movement in verticalplanes, drilling mechanism carried by said drill supporting arm, saidmechanism including a drill extending at right angles to said drillsupporting arm and a portion xable to the latter in varied positions ofrelative angular adjustment, a motor arranged to actuate said drillingmechanism, and devices actuated by said motor connected and arranged toeffect and control the vertical movement of said drill supporting arm asand for the purpose set forth.

2. In a coal drilling machine, the combination with a wheel supportedcarriage adapted to rest upon and be braced by the rails of a mine trackduring the drilling operation, of power devices upon the carriageadapted to propel it along said rails, means to prevent movement of saidcarriage relative to said rails, an arm pivotally attached to saidcarriage for movement in horizontal planes, means to lock said armagainst said pivotal movement, a drill supporting arm pivotally attachedto said first mentioned arm adapted to movement in both vertical andhorizontal planes, means to look 'the second mentioned arm againsthorizontal movement, drilling mechanism carried by said drill supportingarm, a motor upon said arm arranged to actuate said drilling mechanism,and devices actuated by said motor connected and arranged to effect andcontrol the vertical movement of said drill supporting arm as and forthe purpose set forth.

3. In a coal drilling machine, the combination with a wheel supportedcarriage adapted to rest upon and be braced by the rails of a mine trackduring the drilling operation, of power devices upon the carriageadapted to propel it along said rails, means to prevent movement of saidcarriage relative to said rails, an arm pivotally attached to saidcarriage for movement in horizontal planes, means to lock said armagainst said pivotal movement, a turntable mounted at the outer end ofsaid arm for rotation in a horizontal plane, means to look saidturntable in the preferred position of angular adjustment, a drillsupporting arm pivotally attached to said turntable adapted to movementin vertical planes, drilling mechanism carried by said drill supportingarm, and power devices connected and arranged to effect and control thevertical movement of said drill supporting arm as and for the purposeset forth.

4. In a coal drilling machine, the combination with a supporting frame,of an arm pivotally attached thereto for movement in horizontal planes,means to lock said arm in the preferred position of angular adjustment,a turntable mounted at the outer end of said arm for rotation inhorizontal planes, means to lock said turntable in the preferredposition of angular adjustment, a drill supporting arm pivotallyattached to said turntable for movement in vertical planes, drillingmechanism carried by the second mentioned arm, and means to effect andcontrol vertical movement of the second mentioned arm including a motormounted on the latter.

5. In a coal drilling machine, the combination Witha main frame, of anarm pivotally attached thereto, drilling mechanism carried by said arm,a screw shaft extending longitudinally of said arm, a nut operativelyengaging said screw shaft, connections between said nut and the mainframe, and means to rotate said screw shaft to effect angular movementof said arm about its pivotal support as and for the purpose set forth.

6. In a coal drilling machine, the combination with a main frame, of anarm pivotally attached thereto, drilling mechanism carried by said arm,a screw shaft extending longitudinally of said arm, a nut operativelyengaging said screw shaft, connections between said nut and the mainframe, and a motor mounted upon said arm and operatively connected withsaid drilling mechanism, and means actuated by said motor to rotate saidscrew to effect angular movement of said arm about its pivotal supportas and for the purpose set forth.

.7. In a coal drilling machine, a support, an arm pivotally mounted atone end on said support, drill mechanism on the free end of said arm, apower shaft extending longitudinally of said arm in operative connectionwith said drill mechanisin, means for swinging said arm about its pivotpoint, and selective forward and reverse drive connections between saidshaft and said swinging means, said drive connections including a clutchelement slidable on said shaft.

8. In a coal drilling machine, a support, an arm pivotally mounted atone end on said support, drill mechanism on the free end of said arm, apower shaft extending longitudinally of said arm in operative connectionwith said drill mechanism, a screw spindle rotatably mounted on saidarm, a nut engaging said spindle, a link connecting said nut and saidsupport, and selective forward and reversedrive connections between said.v shaft and said spindle, for the purpose described.

9. `In a coal drilling machine, a support, an `arm pivotally mounted atone end on said support, drill mechanism mounted `on the free end ofsaid arm, a power` shaft` extending longitudinally of saidarm inoperative connection with said drill mechanism, a screw spindlerotatably mounted on said arm in substantially; parallel relation tosaid power shaft, a pair of sleeves on said shaft, a sprocket'on one ofsaid sleeves, a gear on the other of said sleeves, a sprocket wheel anda gear on said spindle, a chain connecting said sprockets, Said gearsbeing in mesh with each other, a nut on said spindle, a link connectingsaid nut and said support, and means to engage said shaft with either ofsaid sleeves whereby said spindle is rotatable Vin either direction. l

10. In a coal drilling machine, a support, an arm pivotally mountedatone end on said support, amotor adjacent the pivotally mounted end ofsaid arm and having a casing forming a section of said arm, a drillmechanism on the free end of Asaid arm, and transmission means betweensaid motor and said drill mechanism.`

l1. In a coal drilling machine, a support, a

pair of arms pivoted to said support at a common point to swing inhorizontal planes, a drill mech-- anismin connection with the free endof each of said arms, a locking plate having a toothed edge concentricwith the pivot pointof said arms, and

a latch on each of said Varmsadapted to engage4 said toothed edge forthe purpose described.

1'2. In a coal drilling machine,V the combination with a support, of anarmin pivotal connection with saidsupport, a motor at the pivoted end ofthe arm, the motor having a casing forming a section of the arrna shaftextending longitudi-4 nally of the arm, and driven by the motor, drill`mechanism supported by the free end;of saidt arm for relative rotaryadjustment in a plane at right angles to said shaft, and a drivingconnection between said shaft and said drill mechanism. i 1

13. In` a coal drilling machine, the combination with a support, ofwanarm in pivotal con-` nection with said support, a motor at the pivotedendof the arm, a shaft extending longitudinally of the arm and driven bythe motor, drill mechi anismsupported, by the free end of the arm, a

driving -connection between the shaft anddrill mechanism, and meansdriven by the motor for swinging the arm about its pivot.

14. In a coal drilling machine, the combination with a support, of anarm in pivotal connection with said support, a motor at the pivoted endof the arm, a shaft extending longitudinally of the arm vand driven bythe motor, drill mechanism supported by the free end of the arm, a

driving connection between the` shaft and drill mechanism, and meansdriven from the shaft for swinging the arm about its pivot.

15. In a coal drilling machine, the combination with a support, of anarm in pivotal connection with said support, drill mechanism on the freeend of the arm, a power shaft extending longitudinally of said arm inoperative connection with said drill mechanism, a screw spindlerotatably mounted on said arm in parallel relation to said shaft, Ia.nut engaging said spindle, a link connecting said nut and said support,a pair of sleeves rotatable von said shaft, clutch means rto selectivelyconnect said sleeves to said shaft, a driving connection between one ofsaid fsleeves and said spindle forrotating the latter in one direction,and a driving connection between the other of said sleeves and the shaftto drive the latter in the other direction.

16. In a coal drilling machine, the combination with a support, of an`arm in pivotal connection with said support for relative swingingmovement about a horizontal and a vertical axis, a motor atthe pivotedend of the arm, a shaft extending longitudinally of the arm and drivenby the motor, drill mechanism supported by the free end of the arm, adriving connection between the shaft and drill mechanism, and meansdriven 'by the motor for swinging the arm about its horizontal axis.

17. In a coal drilling machine, the combination with a support, of anarm in pivotal connection with said support for relative swingingmovemenl about horizontal and a vertical axis, a motor at the pivotedend of the arm, a shaft extending longitudinally of the arm and drivenby the motor, drill mechanism supported by the free end 'of the arm, adriving connection between the shaft and drill mechanism, and meansdriven from the shaft `for swinging the arm about its horizontal axis.

18. In a drilling mechanism, the combination with a carriage movablerelative to a coal face, a-

member pivotally mounted upon said carriage for rotary movement in oneplane, a second member pivotally mounted'uponv the rst mentioned mem--ber for rotary movement in a plane at right angles to the plane ofmovement of the second member, drilling mechanism carried by the thirdmember, a motor mounted on said second inember, a driving connectionbetween the motor and drilling mechanism, `and means driven by saidmotor to effect relative angular adjustment of the second member to therst.

19. In `a coal drilling machine, a supporting element, an arm element inpivotal connection at one end with said supporting element, a motor, ashaft extendinglongitudinally of the arm e1ement, a drive connectionbetween the motor and said shaft, `drill mechanism supported by the armelement at the free end of the latter, a drive connection between saidshaft and drill mechanism, a link extending between the arm elementadjacent its pivoted end and the supporting element, said link beingpivoted at one end directly to one of said elements, a member on theother of said elements reciprocable substantially in the swinging planeof the link, the other end of the link having a pivotal connection withsaid member, and means driven by said motor for reciprocating saidmember to swing the arm.

20. In a coal drilling machine, a supporting element, an arm element inpivotal connection at one end with said supporting element, a motor, ashaft extending longitudinally of the arm element, a drive connectionbetween the motor and said shaft, 'drill mechanism supported by the armelement` at the free end of the latter, a drive connection between saidshaft and drill mechanism` a link extending between the arm elementadjacent its pivoted end and thev supporting element, said link `beingpivoted at one end directly to one of said elements, a member on theother of said elements rectilinearly `reciprocable substantially in theswinging plane of the link, the other end of the' link having a pivotalconnection with said member, and means driven from said shaft forreciprocating said member to swing the arm.

21. In a coal drilling machine, `a supporting element, an arm element inpivotal connection at one end with said supporting element, a motor, ashaft extending longitudinally of the arm element, a drive connectionbetween the motor and said shaft, drill mechanism supported by the armelement at the free end of the latter, a drive connection between saidshaft and drill mechanism, a link extending between the arm elementadjacent its pivoted end and the supporting element, said link beingpivoted at one end directly to one of said elements, a screw spindlejournaled on the other of said elements substantially in the swingingplane of the link, means driven by said motor for rotating the spindlein either direction, a nut on the spindle and reciprocable thereby, anda pivotal connection between the other end of said link and said nut.

22. In a coal drilling machine, a supporting element, an arm element inpivotal connection at one end with said supporting element, a motor, ashaft extending longitudinally of the arm element, a drive connectionbetween the motor and said shaft, drill mechanism supported by the armelement at the free end of the latter, a drive connection between saidshaft and drill mechanism, a link extending between the arm elementadjacent its pivoted end and the supporting element, said link beingpivoted at one end directly to one of said elements, a screw spindlejournaled on the other of said elements substantially in the swingingplane of the link, reversible drive connections between said motor andspindle for rotating the latter in either direction, manually operablecontrol means for said reversible drive connections, a nut on thespindle and reciprocable thereby, and a pivotal connection between theother end of said link and said nut.

23. In a coal drilling machine, a support, an arm in pivotal connectionat one end with the support, a motor, a shaft extending longitudinallyof the arm element, a drive connection between the motor and said shaft,drill mechanism supported by the arm at the free end of the latter, amember reciprocable in parallel relation to the arm and in connectionwith the latter, motor operated means for reciprocating said member, anda link pivoted at one end to'`A` said support and at the other to saidmember whereby the arm is adapted to rbe swung upon reciprocation ofsaid member.

. 24. In a coal drilling machine, a support, an arm in pivotalconnection at one end with the support, a motor, a shaft extendinglongitudinally of the arm element, a drive connection vbetween the motorand said shaft, drill mechanism supported by the arm at the free end ofthe latter, a screw spindle journaled on the arm in substantiallyparallel relation thereto, motor driven means for driving said spindlein either direction, a nut on said spindle and reciprocable thereby, anda link pivoted at one end to said support and at the other end to saidnut whereby the arm is adapted to be swung upon reciprocation of saidnut.

25. In a drilling apparatus, the combination .with a portable support,of a forwardly extending boom pivotally mounted at its rear end on saidsupport for swinging movement about vertical and horizontal axes, adrilling tool, a support therefor adjustably carried at the outer end ofsaid boom, a motor, mechanism driven by said motor for driving saiddrilling tool, and mechanism driven by said motor for swinging said boomabout its horizontal axis.

26. In a drilling apparatus, the combination with a portable support ofan elongated supporting arm pivotally mounted at its rear end on saidsupport for swinging movement about vertical and horizontal axes, saidarm being swingable horizontally and vertically about said axes, adrilling tool, a support therefor adjustably mounted on the outerextremity of said arm, a motor for driving said drilling tool, andmechanism driven by said motor for swinging said arm on said horizontalaxis.

27. In a drilling machine, the combination with a truck adapted totravel on a mine track, of a turntable support mounted on said truck forrotation relatively thereto on an upright axis, an elongated boompivotally mounted on said turntable support for swinging movementsrelatively thereto on a horizontal axis, a drilling tool supported onthe outer end of said boom and adjustable on an axis extendinglongitudinally of the boom, a motor for driving said drilling tool, andmechanism driven by said motor for swinging said boom on said horizontalaxis.

28. In drilling apparatus, the combination with an elongated boom, of asupporting frame, means for adjustably mounting said boom on said framefor movement to laterally and vertically inclined positions, a drill,mechanism mounting said drill on said boom for adjustment to horizontalpositions at right angles to a working face in advance of said frame andat any point on said face, a motor for operating the drill in any of itsadjusted positions, and means driven by said motor for swinging saidboom to its vertically inclined positions and locking the same againstup and down movements while said drill is in operation.

29, In drilling apparatus, the combination with a portable support, of apair of independently adjustable elongated booms each mounted on saidsupport for free swinging movement relatively thereto on an uprightaxis, releasable locking means for holding said booms in adjustedpositions relative to said portable support, two drilling tools onemounted at the outer extremity of each of said supporting structures foradjustment relative thereto on the longitudinal axes of the booms, motoroperated self-locking mechanism for independently adjusting theelevations of the outer ends of said booms to adjust the positions ofsaid drilling tools into different relatively high parallel positions inplanes above the top of said support and into different relatively lowparallel positions in planes below said top to enable said drillingtools to drill holes in parallel positions at various elevations atopposite sides of said support and in horizontal planes above and belowthe top of said portable support, and motor operated mechanism fordriving said drilling tools while occupying their adjusted positions inparallelism to each other.

30. In drilling apparatus, the combination with a wheeled supportmovable over a mine track and operable while positioned thereon, an armpivoted on said support and swingable from side to side of said supportacross the front thereof to position the free end of said arm at eitherside or in front of the support, a second arm pivoted on the free end ofthe rst for swinging movement relative thereto on vertical andhorizontal axes, a drill carried at the free end of said second arm, adrill driving motor, and means driven by said motor for swinging saidsecond arm about its horizontal axis, said last named means beingoperative to hold said second arm in adjusted position.

3l. In a machine of the class described, a wheel mounted frame adaptedto travel on a mine track,

a pair of rotary drilling tools, means for rotating said tools andreciprocating them on their own axes; means supporting said tools onsaid frame for positioning at opposite sides of the longitudinal axisthereof, for adjustment toward and away from said axis with the axes ofsaid tools parallel to the longitudinal axis of the frame, for verticaladjustment relative to the frame and for adjustment in the longitudinaldirection of the said longitudinal axis relative to the frame; and meansfor advancing the frame whereby said tools may be engaged in a face inadvance of the frame and at variously spaced points on the facedetermined by the adjustment of said tools to drill holes in said faceparallel to the line of advance of said frame.

32. In a machine of the class described, a Wheel mounted frame adaptedto travel cna mine track, a pair of arms pivotally mounted on said frameand swingable horizontally to position their free ends in various spacedrelations laterally of the frame at opposite sides thereof, rotarydrilling tools pivotally supported on the free ends of said armsrespectiveiy so as to be positionable in parallel relation to thelongitudinal axis of the frame in various angular relations of said armsto said axis andat equal distances at the sides of said axis, means foradjusting the elevation of said tools, means for holding said arms inadjusted position, means for rotating said drilling tools, and means foradvancing the frame whereby said tools may be engaged in a faceinadvance of the frame and at variously spaced points on said iacedetermined by the position of said arms to drill holes in said faceparallel to the line of advance of said frame. v

33, In a machine oi the class described, a wheel mounted .trame adaptedto travel on a mine track,

a pair of arms pivotally mounted on said frame swingable betweenpositions wherein they extend forwardly relative to the frame andwherein they extend oppositely laterally thereof, other arms pivoted tothe free ends oi" the iirst arms on vertical axes, rotary andreciprocable drilling tools carried by said other arms at their freeends on axes perpendicular to the axes of said other arms respectively,said other arms being adjustable about said vertical axes to maintainthe drilling tools perpendicular to a face in advance oi the machineirrespective of the adjustment of the first arms, means for locking a l.of said arms in their adjusted positions, and means for advancing theframe whereby said tools may be engaged in a face in advance oi thei'rarne and at variously spaced points on said face determined by theposition of said arms to drill holes in said face parallel to the lineof advance of said frame.

34. In a machine of the class described, a wheel mounted frame adaptedto travel on a mine track, a pair of arms pivotally mounted on saidframe and swingable between positions wherein they eX- tend forwardlyrelative to the frame and wherein they extend oppositely laterallythereof, other arms pivoted to the free ends of the first arms onvertical axes, rotary and reciprocable drilling tools carried by saidother arms at their free ends on axes perpendicular to the axes of saidother arms respectively, means for adjusting the elevation of saidtools, said other arms being adjustable about said vertical axes tomaintain the drilling tools perpendicular to a face in advance of themachine irrespective of the adjustment of the first arms, means forlocking all of said arms in their adjusted positions, and means foradvancing the frame whereby said tools may be engaged in a face inadvance of the frame and at variously spaced points on said facedetermined by the position of said arms to drill holes in said faceparallel to the line of advance of said frame. NILS D. LEVIN.

